fix(static-data-source): if the provided data is null or undefined use the metadata data value

import { clone, isPromiseLike, Constructor } from '@rxap/utilities';

import { ReplaySubject, Observable, isObservable, Subscription } from 'rxjs';

import { Optional, Inject, OnDestroy, Injectable } from '@angular/core';

import {

  clone,

  isPromiseLike,

  Constructor

} from '@rxap/utilities';

import {

  ReplaySubject,

  Observable,

  isObservable,

  Subscription

} from 'rxjs';

import {

  Optional,

  Inject,

  OnDestroy,

  Injectable

} from '@angular/core';

import {

  RXAP_STATIC_DATA_SOURCE_DATA,

  RXAP_DATA_SOURCE_METADATA,

  RXAP_DATA_SOURCE_METADATA

} from './tokens';

import {

  BaseDataSource,

  BaseDataSourceMetadata,

  RxapDataSource,

  RxapDataSource

} from './base.data-source';

import { RxapDataSourceError } from './error';

  private _dataSubscription?: Subscription;

  constructor(

    @Optional() @Inject(RXAP_STATIC_DATA_SOURCE_DATA) data: any | null = null,

    @Optional()

    @Inject(RXAP_STATIC_DATA_SOURCE_DATA)

      data: any | null,

    @Optional()

    @Inject(RXAP_DATA_SOURCE_METADATA)

    metadata: StaticDataSourceMetadata | null = null

      metadata: StaticDataSourceMetadata | null

  ) {

    super(metadata);

    if (data === undefined) {

      data = this.metadata.data ?? null;

    if ((data === undefined || data === null) && this.metadata.data !== undefined) {

      data = this.metadata.data;

    }

    if (data === undefined) {

      throw new RxapDataSourceError(